Lighting unit



April 24, 1934. w SULZER 1,955,985

LIGHTING UNIT Filed Aug. 29, 1932 2 Sheets-Sheet l fizvazzz? Jrmm mil 3 A ril 24, 1934. H. w. SULZER LIGHTING UNIT Filed Aug. 29, 1952 2 Sheets-Sheet 2 Patented Apr. 24, 1934 LIGHTING UNIT Herman W. Sulzer, Philadelphia, Pa., assignor to Sulzer & Company, Inc., a. corporation of Pennsylvania Application August 29, 1932, Serial No. 630,763

2 Claims. (01. 240'78) My invention relates to new and useful improvements in lighting units and'has for one of its objects to provide an exceedingly simple and efiective construction which provides for'the secureinent of the lower portion of an indirect and semi-indirect electric light fixture to the upper portion thereof and the removal of the same.

A further object of the invention is to provide,

for the securement to the lower portion of the fixture a central reflector, which latter serves as means for supporting either a glass bowl or a secondary indirect reflector.

A still further object of the invention is to so construct the fixture that no shadows will be cast by the supporting frame.

With these and other ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawings forming a part of this application, in which:

Fig. 1 is an elevation of a fixture made in accordance with my improvement, a portion thereof being broken away and sectioned to show the construction thereof.

Fig. 2 is a plan view of Fig. 1, a portion of the glass bowl being broken away.

Fig. 3 is a detail plan view of the lower portion of the fixture.

Fig. 4 is a side elevation of Fig. 3. Fig. 5 is an enlarged section'on the line 5-5 of Fig. 4.

Fig. 6 is a detail plan view of the upper portion of the fixture.

Fig. 7 is a side elevation of Fig. 6.

Fig. 8 is an enlarged fragmental section of one of the bayonet joints by which the lower section is secured to the upper section.

Fig. 9 is a detail portion of the upper section of the fixture.

In carrying out my invention as herein embodied, 10 represents the ordinary suspension tube, the lower end of which is threaded for the reception of the threaded socket 11 and this socket has formed therewith the depending arms 12, 00 the lower ends of the latter having formed therewith the ring or band 13, a threaded nipple 14 is formed with the socket 11, all of these parts being cast as a unitary structure forming what I term the upper section of the fixture. The band 13 has formed therewith three bayonet joint slots 15 one of which is shown in Fig. 7, and the inner ends of these slots are turned downward as indicated at 16 for. the purpose hereinafter set forth.

17 represents the lower section of the fixture 69 and consists of the ring or band 18 with which latter are formed the depending arms 19, the lower ends of said arms having formed therewith the ring 20, said ring having the bosses 21 on its upper side and the bosses 22 on its lower side thereof.

The arms 19 extend vertically downward for a certain distance and then extend outwardly at angles for a further distance and finally vertically downward to the ring 20 in order to form a cage of 79 such dimensions as to readily receive theelectric light bulb 23. This bulb is threaded into the usual socket 24, the upper end of which is threaded on to the nipple 14.

In order that shadows may be eliminated, the angular sections and the lower vertical sections of the arms 19 are beveled as clearly shown in Fig. 5, so as to form triangles in cross section, the acute angles being on the outside of the fixture.

The band 18 is provided with three pins 25 which project outward therefrom and are adapted to enter the bayonet joint slots 15 when this band is passed into the band 13 so that when the lower section of the fixture is thereafter turned upon 5 its axis in the proper direction, these pins will pass into the horizontal portion of these slots so that said pins may be drawn downward into the down turned ends 16 of said slots, thus locking the lower section of the fixture to the upper sec- 9 tion thereof.

26 represents the central reflector, the body of which is saucer shaped while its outer portion extends horizontally outward and then upward to form a circular flange 29' and this reflector is secured to the under surface of the lugs 22 by the screws 27, said screws being threaded into said lugs, the ring 20 and the lugs 21.

28 represents a glass bowl having a circular flange 29 for fitting into the flange 29 formed on the reflector 26 as clearly shown in Fig. 1, so that said bowl may be readily placed and held in position against lateral displacement.

When it is desired to utilize a fixture entirely for indirect lighting, instead of the bowl 28 a secondary reflector of the same shape as the glass bowl is used and likewise held in place by the flange 29' of the central reflector 26.

In'practice, the housing 31 is set over the socket 11 and said socket threaded on to the suspension tube 10 in order that this housing may extend downward and enclose the upper section of the fixture and the upper portion of the lower section thereof as well as the lamp socket 24 as clearly shown in Fig. 1.

Thereafter to attach the lower section of the fixture and the parts carried thereby to the upper section, it is only necessary to pass the ring 18 into the ring 13 and turn the lower section in the proper direction to cause the pins to lock into the bayonet joint slots, and as this is a simple process, it is an easy matter to remove the lower portion of this fixture and the parts carried thereby for cleaning and other purposes, it being understood that the lamp bulb 23 is screwed into its socket after the lower section of the fixture is placed in position and that said bulb is to be removed before removal of the lower section, and this insertion or removal of the lamp is provided for by the arms 19 having sufficient space there-between for reaching the bulb and the withdrawal of said bulb from the cage formed by these arms.

When a glass bowl is used in connection with the fixture, the light from the bulb passes through said glass and thus gives direct illumination, while that portion of the light rays from the bulb striking the center of the reflector 26 are reflected upward to give indirect illumination, but when the secondary reflector is used in connection with the fixture, all of the light from the bulb is reflected upward to accomplish complete indirect illumination.

Of course I do not wish to be limited to the exact details of construction herein shown and described as these may be varied within the limits of the appended claims without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful is:-

1. A device of the character described, comprising a threaded socket for securement to a suspension member, a threaded nipple formed integral with said socket and adapted to receive a lamp socket, arms formed integral with said first mentioned socket and depending therefrom, a band formed integral with the lower ends of said arms, said parts constituting the upper section of the fixture, another band, arms formed integral therewith and depending therefrom, a ring formed integral with the last mentioned arms, said last mentioned band, arms and ring constituting the lower section of the fixture, means to detachably connect the band of the lower fixture section with the band of the upper fixture section, a reflector secured to the underside of the ring of the lower fixture section and provided with a peripheral flange spaced from the periphery of said last mentioned ring, and a bowl shaped member having a central opening fitted in the flange of said reflector with the arms of the lower fixture section projecting through said opening. 7

2. A device of the character described, comprising upper and lower fixture sections detachably connected together, a ring included as a part of the lower fixture section and located at the bottom thereof, a reflector secured to the underside of said ring and having a portion extending beyond the periphery of the ring, an upstanding peripheral flange on said reflector, and a bowl shaped member having a central opening, the

inner edge of which is seated on the extending portion of the reflector between the ring and the flange of said reflector.

HERMAN W. SULZER. 

